A genus distinguished by its long, bidentate rostellum and 2-lobed stigma, its placement remains a matter of contention. The nature of the column has been thought to affiliate the genus with Gymnadenia and Neottianthe (Bull. Fan Mem. Inst. Biol. Bot. 7: 133. 1936); however, Tsaiorchis has also been considered congeneric with Diphylax (Pridgeon et al., Gen. Orchid. 2: 284-286. 2001).